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Turnagain Pass Avalanche Forecast RSS

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ARCHIVED FORECAST - All forecasts expire after 24 hours from the posting date/time.
Issued
Wed, March 11th, 2015 - 7:00AM
Expires
Thu, March 12th, 2015 - 7:00AM
Forecaster
Heather Thamm
The Bottom Line

In the Alpine, above 2500′, the avalanche danger is MODERATE where isolated pockets of wind slab 1-2′ thick may be found in steep complex terrain such as steep gullies and convex rollovers. These will be more developed just off the top of ridges on Northern and Eastern aspects. On very steep slopes where snow is loose and unconsolidated sluffing will also be a hazard to manage.

The avalanche danger below 2500′ is LOW where triggering an avalanche is unlikely.  

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Wed, March 11th, 2015
Alpine
Above 2,500'
Moderate (2)
Avalanche risk
Treeline
1,000'-2,500'
Low (1)
Avalanche risk
Below Treeline
Below 1,000'
No Rating (0)
Avalanche risk
Alpine
Above 2,500'
Avalanche risk
Moderate (2)
Treeline
1,000'-2,500'
Avalanche risk
Low (1)
Below Treeline
Below 1,000'
Avalanche risk
No Rating (0)
Danger Scale:
No Rating (0)
Low (1)
Moderate (2)
Considerable (3)
High (4)
Extreme (5)
Avalanche Problem 1
  • Wind Slabs
    Wind Slabs
Wind Slabs
Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.
More info at Avalanche.org

After a three-day period of moderate Westerly winds accompanied by 6” of new snow, lingering wind slab instability remains our primary concern. Due to the unusual wind direction of this last storm pockets of wind slabs1-2′ thick are likely to be the more tender on steep Northern and Eastern slopes. These wind slabs could also be found on other aspects where cross-loading is more common like along gullies and on leeward aspects of terrain features.  

Use caution in steep terrain and avoid smooth pillow shaped features. These wind slabs could vary from hard to soft and are likely to break above you. Be sure to practice safe travel habits. Identify safe spots, move between islands of safety one at a time, and always have an escape zone in mind. 

On a side note… Skiing and riding conditions are better than they look in Turnagain Pass. Pockets of loose unconsolided (Powder) snow are easily found on good portions of Southwestern aspects. Surface conditions are variable along ridgelines, but wind erosion is softer and more forgiving than it appears. 

A view of Hippy Bowl from 3200′ on Tincan. Soft Sastrugi (wind erosion) along ridges makes for easy access to nice powder stashes on Southwestern aspects.  

 

Additional Concern
  • Dry Loose
    Dry Loose
Dry Loose
Dry Loose avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.
More info at Avalanche.org

Cold temperatures are continuing to “dry” out the surface snow and fast moving snow “sluffs” could pick up enough speed to knock you off your feet. This is minor concern, but one worth keeping in the back of your mind if venturing in steep terrain. 

Weather
Wed, March 11th, 2015

Yesterday skies were clear and day-time temperatures reached the teens F in the sun. Ridgetop temps and overnight lows hovered around 0 F. Winds were light 5-10 mph from the West. No new precipitation fell in the last 24 hours.

Today expect more of the same; clear skies and cold temps. Day-time temperatures may reach 10 F and lows should dip to -5 F. Ridgetop winds will increase later in the day, 10-20 mph from the West, and no precipitation is expected.

More cold dry weather is expected through the weekend. The next talk of precipitation is early next week as a large Sourtherly flow near Kodiak is expected to move North and East. There is uncertainty if it will reach Southcentral Alaska, but if it does, expect warm temperatures and moisture.  

PRECIPITATION 24-hour data (6am – 6am)

  Temp Avg (F) Snow (in) Water (in) Snow Depth (in)
Center Ridge (1880′) 8   0   0   44  
Summit Lake (1400′) 4   0   0 9  
Alyeska Mid (1700′) 8 0   0   27  

RIDGETOP 24-hour data (6am – 6am)

  Temp Avg (F) Wind Dir Wind Avg (mph) Wind Gust (mph)
Sunburst (3812′) 1   W   5    13
Seattle Ridge (2400′) 2   W   6    17
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Riding Areas
Updated Fri, May 01st, 2020

Status of riding areas across the Chugach NF is managed by the Glacier and Seward Ranger Districts, not avalanche center staff. Riding area information is posted as a public service to our users and updated based on snow depth and snow density to prevent resource damage at trailhead locations. Riding area questions contact: mailroom_r10_chugach@fs.fed.us

Area Status Weather & Riding Conditions
Glacier District
Johnson Pass
Closed
Placer River
Closed
Skookum Drainage
Closed
Turnagain Pass
Closed
Closed as of May 1. Thanks for a fun, safe season!
Twentymile
Closed
Seward District
Carter Lake
Closed
Lost Lake Trail
Closed
Primrose Trail
Closed
Resurrection Pass Trail
Closed
Snug Harbor
Closed
South Fork Snow River Corridor
Closed
Summit Lake
Closed

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This is a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area. This advisory does not apply to highways, railroads or operating ski areas.